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The woman who killed three people and wounded others before shooting herself to death at a Maryland drugstore warehouse had been diagnosed with a mental illness and used a legally purchased gun in the rampage, a law enforcement official said Friday.

Harford County Sheriff Jeffrey Gahler told news reporters Friday that the suspect, 26-year-old Snochia Moseley of Baltimore County, had been diagnosed with a mental illness in 2016. "That's as far as I'll go with it," he said, declining to give any more details on her mental state.

He said Moseley had become increasingly agitated in recent weeks, and relatives had been concerned for her well-being.

Gahler said she used a handgun that she legally purchased in March to fire a total of 13 rounds Thursday morning, and died after shooting herself in the head.

Gahler identified the three people Moseley fatally shot as Sunday Aguda, a 45-year-old man from Baltimore County; Brindra Giri, a 41-year-old woman from Baltimore County; and Hayleen Reyes, a 41-year-old woman from Baltimore. He also identified the survivors as Hassan Mitchell, a 19-year-old man from Harford County; Wilfredo Villegas, a 45-year-old man from Montgomery County; and Acharya Purna, a 45-year-old man from New York.

He also gave more details about how the violence unfolded.

Moseley had been hired for the holiday season and had been working there for less than two weeks. She entered the building at 6:30 a.m. As people lined up to come in the building, Gahler said she cut in line and words were exchanged, but it was a "little incident." She left around 7:21 a.m. Moseley, who had worked security jobs in the past, drove to her White Marsh home and got a handgun, pepper spray and handcuffs. She arrived back at the parking lot around 8:35 a.m. and entered the front door around 8:52 a.m.

He says she pulled a hooded shirt over her head and began shooting, striking and killing Aguda outside the building. Inside, where there were about 65 people, she fatally shot Giri and Reyes and also shot Mitchell, Villegas and Purna, who survived. She shot herself twice before police arrived, he said — once with a grazing wound and then with the fatal shot. She was already down when officers arrived and an officer moved her from the scene, not knowing that she was the shooter, he said.

When asked how Moseley could legally buy a gun after being diagnosed with a mental illness, officials said it had not been determined that she had a "propensity for violence to self or others."

The sheriff said the motive is still a mystery and may remain so.

"There's just no way to make sense of something so senseless," he said. "There's still a lot of questions that we don't know."